如何使用 c# winform 从给定配置文件的 appSettings 获取值？

Question

我正在提供 .config 文件路径，我想从给定的 .config 文件中检索 key=MYDATA 的 appSetting 值。

我尝试了以下代码，但没有达到预期效果。

//System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

        //var classLibrary1AppSettings = (System.Collections.Specialized.NameValueCollection)System.Configuration.ConfigurationManager.GetSection("appSettings");

        //config.AppSettings.File = "C:\mydemo\web.config";

want to get value for key=MYDATA

Answer 1

终于搞定了，发帖对大家有帮助

System.Configuration.ExeConfigurationFileMap configFileMap = new ExeConfigurationFileMap();
            configFileMap.ExeConfigFilename = "C:\mydemo\web.config";

            System.Configuration.Configuration configuration = ConfigurationManager.OpenMappedExeConfiguration(configFileMap, ConfigurationUserLevel.None);
            AppSettingsSection section = (AppSettingsSection)configuration.GetSection("appSettings");
            if (section.Settings.AllKeys.Any(key => key == "MYDATA"))
            {
                section.Settings["MYDATA"].Value = updateConfigId;
                configuration.Save(ConfigurationSaveMode.Modified);
                ConfigurationManager.RefreshSection("appSettings");
            }